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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The Koc of phenanthrene, the determinant component (marker substance) in Anthracene oil < 50 ppm BaP, is adopted as representative of the total UVCB substance. Therefore, the marker Koc is 23000.  

Key value for chemical safety assessment

Koc at 20 °C:
23 000

Additional information

Due to the complex composition of anthracene oil < 50 ppm BaP, a single Koc value cannot be determined for the substance. Main components (all PAH) will have their individual Koc values. An extract is presented in the following paragraphs.

Koc values of PAH have been estimated by calculations based on Pow/log Pow values using different relations between Pow/log Pow and Koc/log Koc. Well established is the equation by Karickhoff et al. (1979) derived from experimental data: log Koc = log Pow - 0.21 (or Koc = 0.63 Kow). Koc data quoted will originate from this equation. Koc data derived using this equation have also been used in the EU Risk Assessment Report for Coal-tar pitch, high temperature (European Union 2008).

Overall properties of anthracene oil < 50 ppm will best be represented by the range of Koc values corresponding to the PAH present in anthracene oil (acenaphthene to pyrene, see Chapter 1.). The estimated adsorption coefficients (Koc) extend from approx. 6,000 to 100,000 (range of log Koc = 3.79 - 4.99) for the key constituents in anthracene oil. Due to its high concentration (ca. 30%) in anthracene oil, phenanthrene is selected as marker substance (see Chapter 4.). With a Koc of 23,000 (log Koc = 4.36), it represents characteristics situated somewhere in the middle of the Koc range.

(For Log Pow values of anthracene oil and of relevant PAH see CSR Chapter 1.3 and IUCLID Sect. 4.7).

[LogKoc: 4.36]